Fair Value Measurements Fair Value Measurements (Securities Narrative) (Details) - USD ($) $ in Millions |
3 Months Ended | ||
|---|---|---|---|
May 05, 2018 |
Feb. 03, 2018 |
Apr. 29, 2017 |
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Unrealized Gain (Loss) on Securities | $ 1 | ||
| Investments, Fair Value Disclosure | 17 | $ 17 | $ 5 |
| Fair Value, Inputs, Level 1 [Member] | |||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |||
| Investments, Fair Value Disclosure | $ 17 | $ 17 | $ 5 |